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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HD74LS122P 데이터시트(PDF) 5 Page - Renesas Technology Corp |
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HD74LS122P 데이터시트(HTML) 5 Page - Renesas Technology Corp |
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5 / 8 page  HD74LS122 Rev.2.00, Feb.18.2005, page 5 of 7 Typical Application Data for HD74LS122 For pulse widths when Cext ≤ 1000 pF, See Figure 3. The output pulse is primarily a function of the external capacitor and resistor. For Cext > 1000 pF, the output pulse width (tw) is defined as: tw(out) = K • R ext • C ext; See Figure 4. VCC Rext (k Ω) Cext (pF) tw(out) (ns) Rext to Rext/Cext to Cext Cext + – Figure 2 Timing Component Connections 10 1 10 100 1,000 100 1,000 10,000 100,000 External capacitance Cext (pF) Rext = 80k Ω 40k Ω 20k Ω 10k Ω 5k Ω Rext = 160k Ω Figure 3 Typical Output Pulse Width (Cext ≤ 1000 pF) 0.5 0 0.4 0.2 0.1 Timing capacitance Cext (pF) 0.3 103 2 3 5 7104 2 3 5 7105 2 3 5 7106 2 3 5 7107 VCC = 5V Ta = 25°C Figure 4 Cext vs. K (Cext > 1000 pF) |
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